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Add appropriate types for checksums and add helpers to make usage safer and much easier.
Completely eliminates magic values for the user.
This can be expanded to other calls over time.
AWS is a bit unclear if it supports multiple checksums per call. We don't.
p.formData["x-amz-checksum-"+strings.ToLower(k)] = strings.ToUpper(v)
would have overwritten the value anyway. So the API takes one checksum per call.